Canada's Milos Raonic, the other seeded player in action on the opening day of the grass-court tournament, defeated last year's runner-up, Philipp Petzschner. The fifth-seeded Raonic had 19 aces to beat the German 7-5, 7-6 (1), setting up a second-round match with Ze Zhang of China, who beat another German, Tobias Kamke, 6-4, 7-6 (2).